JPS632462Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a fluid control device using electromagnets in a loom.

Prior Art In general, in a fluid injection loom, the weft is ejected from a main nozzle by a pressure fluid ejected from the main nozzle in synchronization with the weft insertion timing, and is formed by a large number of guide pieces arranged in parallel on the slay. The weft is inserted into the weft guide path. Furthermore, in order to ensure that the weft yarns reach the fabric edge on the opposite side of the weft insertion side of the woven fabric, a plurality of auxiliary nozzles are disposed between the plurality of guide pieces, and the weft yarns are moved by pressure fluid sprayed from the nozzles. It is practiced to assist the weft threads during insertion.

In order to obtain a desired woven fabric using fluid, it is necessary to reliably control the fluid ejected from the main nozzle or the auxiliary nozzle.

Conventionally, as shown in Fig. 1, the conventional method for controlling fluid is a mechanical fluid control device in which a valve 1 that opens and closes a fluid passage is operated by a cam 2 that is rotated in conjunction with a crankshaft. It is used. This mechanical fluid control device uses the time required for the injection pressure of the fluid injected from the main nozzle or the auxiliary nozzle to reach the set injection pressure (hereinafter
Although the valve 1 has the advantage of a short response time (response time), there is a risk that the valve 1 may not be able to reliably close the fluid passage due to fluff adhering to the circumferential surface of the cam 2. In addition, in order to adjust the injection timing and injection time of the fluid injected from the main nozzle or auxiliary nozzle in response to changes in the weaving width of the woven fabric, it is necessary to directly replace the cam 2 or adjust the installation of the cam 2. However, such adjustment is extremely difficult and troublesome.

In order to overcome the drawbacks of this mechanical fluid control device, an electromagnetic fluid control device is also used in which a valve 1 is opened and closed by an electromagnet 3, as shown in FIG. However, conventionally used electromagnetic fluid control devices open and close fluid passages using only one valve, and
Since it is operated by only one electromagnet, it eliminates the drawbacks of mechanical fluid control devices (i.e., it eliminates the trouble caused by fluff and makes it easier to adjust the fluid injection timing).
On the other hand, it had the disadvantage that the response time was longer than that of mechanical fluid control devices. Therefore, in order to ensure that the weft yarn reaches the opposite end of the woven fabric and to eliminate weft insertion errors, it is necessary to maintain the injection pressure from the main nozzle or the auxiliary nozzle at the set injection pressure for a predetermined period of time. A large amount of fluid must be consumed in consideration of the length of the response time, and as a result of the loss of fluid consumption, the weft yarn is exposed to the jetted fluid more than necessary, and the same weft yarn is squeezed and untwisted. There was a risk that it would increase.

Purpose This invention was made to eliminate the defects of conventional mechanical and electromagnetic fluid control devices. A suction member is provided, and the suction member is actuated by an electromagnet that generates a larger suction force only when the valve is activated than when the valve is held in an open state, thereby shortening the response time. The object of the present invention is to provide a fluid control device for a loom that can reduce fluid consumption.

Example Hereinafter, examples embodying the present invention will be described in 3rd and 4th examples.
To explain based on the figure, 11 is a fluid passage 1 leading from a fluid supply source (not shown) to a main nozzle (not shown).
A communication hole 11c, which is a fluid passage opening/closing member disposed in the middle of the fluid passageway 2 and which communicates the suction chamber 11a and the discharge chamber 11b, is opened and closed by a valve 13. This valve 13 is fixed to a rod 14 made of a non-magnetic material that penetrates both side walls of the fluid passage opening/closing member 11, and is normally configured to close the communication hole 11c by a spring 15.

Reference numerals 16 and 17 denote a pair of attraction members made of ferromagnetic material fixed to both ends of the rod 14. Reference numeral 18 denotes a first electromagnet disposed close to the suction member 16 so that the suction member 16 is attracted in the opening direction of the valve 13 (in the direction in which the valve 13 moves to the left in FIG. 3); Similarly, the second electromagnet is disposed close to the suction member 17 so that the suction member 17 is attracted in the direction in which the valve 13 is opened. Both electromagnets 18 and 19 are operated based on a signal current generated from a control section (not shown) in synchronization with the weft insertion timing, respectively.
The electromagnet 18 is actuated during one rotation of the loom (i.e., the crankshaft rotates through 360°) based on the signal current S1 shown in FIG. 4a, and the second electromagnet 19 is actuated based on the signal current S2 shown in FIG. operated on the basis of That is, the first electromagnet 18 starts and holds the valve 13, and the second electromagnet 19 starts and holds the valve 13.
It is designed to only start the .

Now, when the signal current S1 is sent from the control section to the first electromagnet 18 and the signal current S2 is sent to the second electromagnet 19 in synchronization with the weft insertion timing,
Both electromagnets 18 and 19 attract the suction members 16 and 17, and move the valve 13 in the opening direction against the pressing force of the spring 15. At this time, the injection pressure of the fluid injected from the main nozzle shows a rise as shown by the curve C1 in FIG. 4c, and reaches the set injection pressure P. Thereafter, the signal current S2 is stopped and the second electromagnet 19 is demagnetized, so that even if the attraction member 17 is no longer attracted, the first electromagnet 18 holds the valve 13 in the open state. Therefore, the injection pressure of the fluid injected from the main nozzle is maintained at the set injection pressure P. Then, when the signal current S1 is stopped, the first electromagnet 18 is demagnetized, and the attraction member 16 is no longer attracted, the valve 13 closes off the communication hole 11c by the pressing force of the spring 15. At this time, the injection pressure of the fluid injected from the main nozzle decreases to zero as shown by curve C2 in FIG. 4c.

The conventional electromagnetic type fluid control device corresponds to the case in which the second electromagnet 19 is not activated in this embodiment, but when only the first electromagnet 18 is activated, the fluid injection pressure is as shown by curve C3 in FIG. 4c. The injection pressure reaches the set injection pressure P with a rise shown in FIG.

As is clear from comparing both curves C1 and C3, the rise of curve C1 is more rapid than that of curve C3. In other words, the electromagnetic fluid control device of this embodiment has a longer time required for the injection pressure of the fluid injected from the main nozzle to reach the set injection pressure (response time) than the conventional electromagnetic fluid control device. ) is short. The response time of conventionally configured electromagnetic fluid control devices is approximately 10 to 15 milliseconds (at low rotational speeds).
In a high-speed loom of 500 rpm, the rotation angle is equivalent to 30° to 45°), but in the electromagnetic fluid control device of this embodiment, it can be shortened to about half.

The reason for this shortened response time is that the second electromagnet 19 is used to double the suction force when the valve 13 is started, thereby increasing the opening speed of the valve 13.

In addition to this embodiment, a method for increasing the opening speed of the valve 13 is to omit the second electromagnet 19,
It is also conceivable to use, for example, an electromagnet having twice the attraction force of the first electromagnet 18 instead of the first electromagnet 18. However, due to the characteristics of electromagnets, even if the power consumption per unit time is doubled, it is not possible to obtain twice the attractive force, and therefore, this method has the drawback of increasing power consumption. Furthermore, since only one electromagnet is used, it is necessary to hold the valve 13 by an electromagnet that consumes a large amount of power per unit time, which leads to even greater power loss. Therefore, it can be said that a fluid control device using only one electromagnet is inferior to the fluid control device of this embodiment in terms of power consumption.

Note that it is desirable that the curve C2 decreases as sharply as possible (that is, to prevent the weft yarn from being exposed to the jet fluid more than necessary), but this increases the elastic modulus of the spring 15 and increases the elasticity of both electromagnets 1.
This problem can be solved by increasing the suction power of points 8 and 19.

As described above, in this embodiment, by starting the valve 13 using the two electromagnets 18 and 19, the response time can be shortened compared to an electromagnetic fluid control device having a conventional configuration. In turn, fluid consumption can be reduced. Further, in this embodiment, the valve 13 is held only by the first electromagnet 18, but by doing so, power loss can be suppressed.

In addition, by adopting an electromagnetic method, the present invention can solve the problem of fluff that occurs with mechanical fluid control devices, as well as the difficulty in adjusting the opening/closing timing of the valve 13 and the injection time. Automation can be further promoted.

Note that the present invention is not limited to the above-mentioned embodiments; for example, three or more electromagnets may be used, the valve 13 may be held open by the second electromagnet 19, or the second electromagnet 19 may be used. First electromagnet 1
8, or embodying the present invention in an air-type weft storage device or controlling the fluid jetted from an auxiliary nozzle, or using other known means to increase or decrease the attraction force of the electromagnet. However, it is also possible to make arbitrary changes and embodiments without departing from the spirit of the present invention.

Effects As detailed above, the present invention has the effect of shortening the response time and, in turn, suppressing fluid consumption, making it an excellent invention for industrial use as a fluid control device for looms. be.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing a conventional mechanical fluid control device, FIG. 2 is a vertical cross-sectional view showing a conventional electromagnetic fluid control device, and FIG. 3 is a vertical cross-sectional view showing a conventional electromagnetic fluid control device. Fig. 4a is a graph showing the signal current emitted to the first electromagnet in the above embodiment, Fig. 4b is a graph showing the signal current emitted to the second electromagnet, and Fig. 4c is a graph showing the main It is a graph which shows the injection pressure of the fluid injected from a nozzle. Fluid passage...12, Valve...13, Rod...
...14, Suction member...16, 17, Electromagnet...1
8,19.

Claims (1)

[Claims for Utility Model Registration] 1. A fluid passage opening/closing member is interposed in the passage of fluid injected in connection with weft insertion of a loom, and a valve of the opening/closing member is actuated in the opening direction of the fluid passage when the fluid is jetted. In a fluid control device equipped with a valve operating means for maintaining an open state of a fluid passage, the valve is provided with a suction member that is attracted by an electromagnet, and the valve operating means generates a larger suction force when the valve is activated than when the valve is held. A fluid control device for a loom, characterized by comprising an electromagnet that generates. 2. The fluid control device for a loom according to claim 1, wherein the valve operating means is comprised of at least two electromagnets.